MFC r263742:

Fix harmless warning after reconnecting a session and not doing anything
with it.

Sponsored by:	The FreeBSD Foundation
MFC r263743:

Move the ic_outstanding_count under #ifdef DIAGNOSTIC.

Sponsored by:	The FreeBSD Foundation
MFC r263745:

Target Transfer Tag is opaque; no need to htonl(3) it.

Sponsored by:	The FreeBSD Foundation
MFC r263810:

Rework cfiscsi_datamove_in() to obey expected data transfer length
received from the initiator.

Sponsored by:	The FreeBSD Foundation
MFC r263811:

Remove ctl_mem_pool.{c,h}.

Sponsored by:	The FreeBSD Foundation